#include<stdio.h>
int main(void)
{
    int add_num = 0;
    //add_num --;    //add_num = add_num + 1  add_num = add_num - 1;
    printf("The add number is %d\n", --add_num);
    /*
    add_num --; -> -1
    printf("The add number is %d\n", add_num );
    */
    printf("The add number is %d\n", --add_num);
    /*
    add_num --; -> -2
    printf("The add number is %d\n", add_num );
    */
    return 0;
}